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Method for preparing propylene by catalytic cracking olefin of containing carbon

A technology of catalytic cracking and carbon olefins, which is applied in the fields of hydrocarbon cracking, hydrocarbon production, organic chemistry, etc., and can solve the problem of low added value of carbon-containing olefin mixtures, low conversion rate of olefin catalytic cracking, and weak combination of olefin catalytic cracking processes and other problems, to achieve good combinability, save energy consumption, and improve the effect of olefin conversion

Active Publication Date: 2007-12-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the added value of the carbon-containing olefin mixture is not high, the conversion rate of the olefin catalytic cracking is not high, and the combination of the olefin catalytic cracking process is not strong in the prior art, and a new carbon-containing olefin mixture is provided. The method of pyrolysis to produce propylene

Method used

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  • Method for preparing propylene by catalytic cracking olefin of containing carbon

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Effect test

Embodiment 1

[0030] As shown in Figure 1, the carbon-containing olefin mixture feed composition (weight%) is: butene-1: 45%, butane: 35%, pentene-1: 10%, pentane: 10%. Adopt technological process of the present invention, catalyzer is silicon-aluminum ratio (SiO 2 / Al 2 o 3 ) 200 ZSM-5 molecular sieve, the steam to feed weight ratio is 1.5, the reaction temperature is 450°C, the reaction pressure is 0.06MPa, the temperature behind the cooler 6 is 35°C, the cracked product is compressed to 0.8MPa, 88% by weight C 4 Distillate recycle, pilot plant proves that the following proportions of products (% by weight) will be obtained:

[0031] Ethylene: 22.6%

[0032] Propylene: 42.1%

[0033] Other C3 Below: 3.0%

[0034] C 4 Above fraction: 32.3%

Embodiment 2

[0036] As shown in Figure 1, the carbon-containing olefin mixture feed composition is the same as in Example 1, and the process flow of the present invention is adopted, and the catalyst is a ratio of silicon to aluminum (SiO 2 / Al 2 o 3 ) 200 ZSM-5 molecular sieve, the steam to feed weight ratio is 2.0, the reaction temperature is 500°C, the reaction pressure is 0.20MPa, the temperature behind the cooler 6 is 55°C, the cracked product is compressed to 0.65MPa, 68% by weight C 4 Distillate recycle, will obtain the product (weight %) of following ratio:

[0037] Ethylene: 20.2%

[0038] Propylene: 45.0%

[0039] Other C 3 Below: 2.8%

[0040] C 4 Above fraction: 32.0%

Embodiment 3

[0042] As shown in Figure 1, the carbon-containing olefin mixture feed composition is the same as in Example 1, and the process flow of the present invention is adopted, and the catalyst is a ratio of silicon to aluminum (SiO 2 / Al 2 o 3 ) 200 ZSM-5 molecular sieve, the steam to feed weight ratio is 3.5, the reaction temperature is 550°C, the reaction pressure is 0.3MPa, the temperature after the cooler 6 is 75°C, the cracked product is compressed to 1.0MPa, 48% by weight C 4 Distillate recycle, will obtain the product (weight %) of following ratio:

[0043] Ethylene: 18.8%

[0044] Propylene: 43.3%

[0045] Other C 3 Below: 3.6%

[0046] C 4 Above fraction: 34.3%.

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Abstract

This invention relates to a method for preparing propylene by catalytic cracking of hydrocarbons. The method solves the problems of low added value, low conversion rate and low associativity of catalytic cracking process faced by traditional technique. The method comprises: gasifying liquid-phase hydrocarbon mixture by heat exchange with catalytic cracking product, mixing with overheated diluted steam to reach the reaction temperature, performing heat exchange between catalytic cracking product and condensed steam, passing through an air cooler and a cooler for cooling and separating out condensed steam, performing heat exchange between condensed steam and catalytic cracking product, utilizing as the heat source for the following debutanization and depropanization columns, compressing the catalytic cracking product to 0.3-1.1 MPa, sending into the depropanization column, separating to obtain C3 or below fractions at the overhead, separating with an ethylene apparatus to obtain propylene and ethylene, sending C4 or higher fractions at the bottom into the debutanization column, separating C4 fractions at the overhead, and recycling 30-90 wt.% into the reactor.

Description

technical field [0001] The invention relates to a method for producing propylene by catalytic cracking of carbon-containing olefins. Background technique [0002] Propylene and ethylene are important basic organic chemical raw materials. Propylene is mainly used to produce PP, cumene, acrylonitrile, acrylic acid and many other products; ethylene is used to produce polyethylene (PE), polyvinyl chloride (PVC) and ethylene oxide / ethylene glycol (EO / EG), etc. The main raw material of organic chemical products. As important light olefins, the annual demand for propylene and ethylene keeps growing. Thermal cracking of hydrocarbons is still one of the main methods for producing ethylene, while the process for producing propylene can generally be summarized as a by-product process and a proprietary process. The by-product process mainly refers to propylene obtained by steam cracking and catalytic cracking ethylene units. Proprietary technology refers to the technology specially ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/06C07C4/06
Inventor 甘永胜钱宏义沈伟胡力智何志
Owner CHINA PETROLEUM & CHEM CORP
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